JP2596929Y2 - Chair back adjuster - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for adjusting the height of a backrest and the size of a seat at the same time according to the body shape of a seated person.

[0002]

2. Description of the Related Art Conventionally, in a chair comprising a seat, a leg supporting the seat, and a backrest supported by the seat or the leg, the backrest is provided with a cushion in the front-rear direction to be vertically moved. It is known to adjust only in the direction.

[0003]

[Problems to be solved by the invention] However, only the height of the backrest can be adjusted in such a manner, and the backrest only has a cushion in the front-rear direction with a weight, and the width of the seat is increased. It cannot be changed, and has a problem that it cannot sufficiently cope with the body shape of a seated person.

[0004]

SUMMARY OF THE INVENTION The present invention has been devised in order to solve such a problem and to make the structure simple and suitable for implementation. Therefore, the present invention is applied to the rear of the seat or the upper rear of the leg. Is formed with a wide fitting holder inclined forward and rearward and high, and an upper part of a support slidably fitted to the fitting holder is provided with an arm having a lower part of an upright backrest curved. Are formed integrally, and a screw with a knob to be inserted into the fitting holder is inserted into the center-side elongated hole of the support, and the support can be tightened to the fitting holder. Things.

[0005]

Therefore, the backrest can be moved back and forth and up and down by loosening the screw to release the tightening and sliding the support into the fitting holder while sliding the screw into the elongated hole. When the screw is tightened, the height of the backrest can be adjusted and the width of the seat in the front-rear direction can be adjusted.

[0006]

FIG. 1 is a side view of an entire chair, and a seat A is mounted on an upper part of a leg B having five casters 6 at a lower portion to constitute a conventional structure. A wide fitting holder 1 that is inclined at an angle θ from front to rear and height is fixed to the rear part, and the fitting holder 1 has a concave groove 8 having a sudden center 7.
A holding plate 1a having recessed grooves 10 and 10 with projections 9 and 9 formed on both sides thereof is joined to a flat holding plate 19, and formed at the center of the holding plates 1a and 19. Hole 1
A screw 4 with a knob 4a is inserted into the screw hole 1 and the screw hole 12, and a snap pin 14 for retaining is inserted into a hole 13 formed at the tip of the screw 4.

The upper portion of the wide support 2 which is slidably fitted to the fitting holder 1 has an upright backrest C.
Is formed integrally through two curved arms 3 and 3, and the support 2 has a ridge 7 of the holding plate 1 a,
The recessed groove 15, the ridges 16, 16, and the ridges 17, 17 that can be fitted into the recessed groove 8 and the recessed groove 10, respectively
Are formed, and non-slip grooves 18, 18 having a scale capable of being pressed against the ridges 9, 9 of the holding plate 1 a and indicating the height are formed, and the groove 15 is formed.
Is formed by forming an elongated hole 5 into which the screw 4 can be inserted. Alternatively, the fitting holder 1 may be provided at the upper rear side of the leg B.

Therefore, when the screw 4 is tightened, the ridges 9, 9 are pressed against the concave grooves 18, 18 to fix the backrest C, and the backrest is bent by the curved arms 3, 3. The cushioning property of the portion C is effectively exhibited, the screw 4 is loosened to release the tightening, and the support 2 is moved to the fitting holding body 1 while the screw 4 is slid into the long hole 5 by the arrow A. 1, the length of the backrest C in the front-rear direction can be adjusted from L ₁ to L ₂ and the height can be adjusted from H ₁ to H _{2 as shown} in FIG.
By tightening, the height of the backrest portion C and the width of the seat portion A in the front-rear direction can be adjusted.

[0009]

As described above, according to the present invention, the screw 4 is loosened to release the tightening, the support 2 is slid on the fitting holder 1 while the screw 4 is slid into the elongated hole 5, and the backrest is provided. When the height of the seat is adjusted, if the seat back is low, the seat surface will be narrowed accordingly, and if the seat back is raised, the seat back will be located at the rear upper side as shown in FIG. The seat 3 is greatly curved rearward, and this portion is just pulled up and occupied, so that the seat surface becomes very wide. And at the same time that you can adjust the backrest up and down, you can also adjust the size of the seat surface,
By just tightening the screw 4 as it is, the height of the backrest C and the width of the seat A in the front-rear direction can be adjusted.
It can be easily adjusted according to the body shape of the person who sits down, and the backrest C can be strongly supported by the wide fitting holder 1, and the support 2 can be firmly tightened. The backrest portion C is provided with a cushion by the curved arm 3 so that it can be favorably supported, and has a feature that it can be suitably implemented with a simple structure that can be easily adjusted.

[Brief description of the drawings]

FIG. 1 is a side view showing the entire chair.

FIG. 2 is a perspective view showing the entire chair.

FIG. 3 is an exploded perspective view showing a part of FIG. 2;

[Explanation of symbols]

 A Seat B Leg C Backrest 1 Fitting holder 2 Support 3 Arm 4 Screw 4a Knob 5 Slot

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) A47C 7/46

Claims (1)

(57) [Scope of request for utility model registration] 1. A seat A, and a leg B supporting the seat A,
In the chair comprising the seat portion A and the back portion C supported by the leg portion B, the rear edge surface of the seat portion A is bent along the bent surface and is inclined at an angle θ to the front low back height. Is formed at the center thereof with a concave groove 8 having a ridge 7 and a perforation 11 and, on both sides of the concave groove 8, ridges 9, 9. To form concave grooves 10 and 10 having a required cross section,
And an arm 3 formed on the rear side of the backrest C to be inserted into the holder 1 and a support 2 extending below the arm 3 are formed by an upper arm It is assumed that a curved portion is formed in a lower portion of the support member 3. The support member 2 following the support member 3 has projections 17 and 17 and fittings on both left and right sides thereof to be inserted into the concave grooves 10 and 10 of the fitting holding body 1. A ridge 16 to be fitted into the ridge 7 concave groove 8 of the joint holder 1;
Further, an elongated hole 5 is formed in the middle of the ridges 16, 16, and the support 2 is fitted on the fitting holder 1 at the trailing edge of the seat portion, and the rear face of the fitting holder 1 is provided. The height of the backrest and the length and width in the front-rear direction are appropriately adjusted by screwing the screw 4 with the knob 4a configured to be inserted into the hole 11 formed in the hole 11 and the elongated hole 5 formed in the support 2. An adjustable chair backrest adjuster.